A funny, entertaining introduction to Ben Franklin and his many inventions, including the story of how he created the "magic square." A magic square is a box of nine numbers arranged so that any line of three numbers adds up to the same number, including on the diagonal! Teachers and kids will love finding out about this popular teaching tool that is still used in elementary schools today!A funny, entertaining introduction to Ben Franklin and his many inventions, including the story of how he created the "magic square." A magic square is a box of nine numbers arranged so that any line of three numbers adds up to the same number, including on the diagonal! Teachers and kids will love finding out about this popular teaching tool that is still used in elementary schools today!
小的時候我知道本杰明富蘭克林是放風(fēng)箏證明證明雷電釋放正負(fù)電荷的人,獨(dú)立宣言起草人之一,陪兒子讀了這本書,對他更是無比敬佩!他發(fā)明了蛙鞋,避雷針,建立美國首個消防局、首個圖書館還有首個醫(yī)院!他自己印刷出版雜志年鑒,年鑒中有那句家喻戶曉的an apple a day keeps doctor away!我想正因?yàn)槿绱嗣绹僭筲n上才用了他的頭像吧。